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Effect of weed killers on weeds?

In: Garden Pests, Organic Gardening, Garden Insect Helpers, Garden Insect Pests, Garden Weeds [Edit categories]

Answer:

It kills their roots.

Answer 2
Not necessarily their roots. Some weedkillers (paraquat, for example) just kill the green parts of plants. Obviously the roots may die in the process but only because the whole plant has died.

Answer #3
Both answers are technically right but are missing some information that should have been included. Herbicides (weed killers) can work in two different ways. 1 The herbicide touches any part of a plant that is above ground and kills that part of the plant but the roots may still live.
2 A herbicide is sprayed and the plant sucks it in (just like it would water) and the herbicide travels through the plant reaching the roots and then kills the plant from there.
That is just a basic answer and doesn't discuss things like soil sterilents or other ways of controlling plant growth. I hope that this was helpful.

First answer by Biolite. Last edit by KellyCampbell5. Contributor trust: 0 [recommend contributor ]. Question popularity: 1 [recommend question].

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